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arXiv 0708.0871astro-ph
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斯隆数字巡天发现四个引力透镜类星体

Discovery of Four Gravitationally Lensed Quasars from the Sloan Digital Sky Survey

Masamune Oguri, Naohisa Inada, Alejandro Clocchiatti, Issha Kayo, Min-Su Shin, Joseph F. Hennawi, Michael A. Strauss, Tomoki Morokuma, Donald P. Schneider, Donald G. York

摘要:

我们提出了四个引力透镜类星体的发现,从斯隆数字巡天的光谱类星体目录中选择。我们描述了成像和光谱的后续观测,支持以下四个类星体的透镜解释:SDSS J 0832 +0404(像分离θ=1.98”,源红移z_s=1.115,透镜红移z_l=0.659); SDSS J1216+3529(θ=1.49”,z_s=2.012); SDSS J1322+1052(θ=2.00”,z_s=1.716);和SDSS J1524+4409(θ=1.67”,z_s=1.210,z_l=0.320)。每个系统都有两个透镜图像。我们发现,SDSS J 0832 +0404的较暗的图像分量比较亮的分量明显更红,这可能是因为透镜星系的差异变红。SDSS J1216+3529的透镜位能可能会因为主透镜星系附近的次级星系而变得复杂。

英文摘要:

We present the discovery of four gravitationally lensed quasars selected from the spectroscopic quasar catalog of the Sloan Digital Sky Survey. We describe imaging and spectroscopic follow-up observations that support the lensing interpretation of the following four quasars: SDSS J0832+0404 (image separation θ=1.98", source redshift z_s=1.115, lens redshift z_l=0.659); SDSS J1216+3529 (θ=1.49", z_s=2.012); SDSS J1322+1052 (θ=2.00", z_s=1.716); and SDSS J1524+4409 (θ=1.67", z_s=1.210, z_l=0.320). Each system has two lensed images. We find that the fainter image component of SDSS J0832+0404 is significantly redder than the brighter component, perhaps because of differential reddening by the lensing galaxy. The lens potential of SDSS J1216+3529 might be complicated by the presence of a secondary galaxy near the main lensing galaxy.

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